Here are the noticeable changes in the above mockup:
1. Embracing Glass: Toolbar and Tabs using Glass. Buttons translucent and slightly glossy to meld with the toolbar. Raised 3D look to achieve tactile “feel”.
2. Tools/Bookmark Bar: Connecting the Tools button to the side of the Window to emphasize the fact that it is used for customizing and changing the UI. Adding a button next to that to toggle the Bookmarks Bar which is turned off by default.
3. Page Button: Connect the Page button to the left side of the tab area. Directly connected to the Page
[via Softpedia]